duete; see due, ty 2 ]. syn: duty, obligation refer to something a person feels bound to do. A duty often applies to what a person performs in fulfillment of the permanent dictates of conscience, piety, right, or law: one's duty to tell the truth; a parent's duty to raise children properly.
Mutations in the RB1 gene are responsible for most cases of retinoblastoma. RB1 is a tumor suppressor gene, which means that it normally regulates cell growth and keeps cells from dividing too rapidly or in an uncontrolled way.
retinoblastoma is a rare type of eye cancer that usually develops in early childhood typically before the age of 5 this form of cancer develops in the retina which is the specialized light sensitive tissue at the back of the eye that detects light and colorutations in the rb1 gene are responsible for most cases of retinoblastoma rb1 is a tumor suppressor gene which means that it normally regulates cell growth and keeps cells from dividing too rapidly or in an uncontrolled way